Add fetch recipe for Skia's Buildbot repository.

Tested with the following command lines:

$ cd
$ mkdir skia_test
$ cd skia_test
$ fetch skia_buildbot
$ cd skia_buildbot
 # confirm the repo is what one would expect.

BUG=None
TEST=see above
R=agable@chromium.org

Review URL: https://codereview.chromium.org/777513002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@293283 0039d316-1c4b-4281-b951-d872f2087c98

recipes/skia_buildbot.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import sys
+
+import recipe_util  # pylint: disable=F0401
+
+
+# This class doesn't need an __init__ method, so we disable the warning
+# pylint: disable=W0232
+class SkiaBuildbot(recipe_util.Recipe):
+  """Basic Recipe class for the Skia Buildbot repository."""
+
+  @staticmethod
+  def fetch_spec(_props):
+    solution = {
+      'name'     : 'buildbot',
+      'url'      : 'https://skia.googlesource.com/buildbot.git',
+      'deps_file': 'DEPS',
+      'managed'  : False,
+    }
+    spec = {
+      'solutions': [solution]
+    }
+    return {
+        'type': 'gclient_git',
+        'gclient_git_spec': spec,
+    }
+
+  @staticmethod
+  def expected_root(_props):
+    return 'buildbot'
+
+
+def main(argv=None):
+  return SkiaBuildbot().handle_args(argv)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))